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Bootstrap Alerts

Bootstrap Alerts are used to provide an easy way to create predefined alert messages. Alert adds a style to your messages to make it more appealing to the users.

There are four classes that are used within <div> element for alerts.

• .alert-success
• .alert-info
• .alert-warning
• .alert-danger

Bootstrap Alert Example

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Bootstrap4 Alert

Bootstrap 4 adds 4 new alerts in Bootstrap Alert defined in Bootstrap 3 tutorial.

These are:

• Primary: This alert box indicates an important action.
• Secondary: This alert box indicates a less important action.
• Dark: Dark grey alert box.
• Light: Light grey alert box.

Alerts are created with the .alert class, followed by one of the contextual classes.

List of all contextual classes:

• .alert-success
• .alert-info
• .alert-warning
• .alert-danger
• .alert-primary
• .alert-secondary
• .alert-light
• .alert-dark

Example

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Alert Links

You have to add the alert-link class to any links inside the alert box to create "matching colored links":

Example:

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Closing Alerts

If you want to close the alert message, you have to add an .alert-dismissable class to the alert container. Then add class="close" and data-dismiss="alert" to a link or a button element (when you click on the close sign, the alert box will be closed.)

Example:

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Animated Alerts

You can use .fade and .show classes to add a fading effect when closing the alert message. Example:

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